Property characteristics

ISSUE: stephen concerned about property chains
Stephen's feedback:
"By consistently using properties with generic names (prov:qualified, prov:entity) to
link Involvements, it will be impossible to define the property chains
that would enable the direct properties (prov:used, prov:wasGeneratedBy,
...) to be inferred from them. To do that, I think there need to be
subproperties which are unique to the different subclasses of
Involvement. It appears that these have only just been removed."